Don't have an answer for you guys but experiencing similar symptoms with a recently bought A4 TDI 170 (B7). It has oil all around the filler cap area and now and again puffs blue smoke when sat idling. Does not smoke under acceleration or whilst driving. Idle is sometimes slightly lumpy. From reading a post on another forum it sounds like the PCV valve may be blocked. There are videos on Youtube that show testing a PCV by unplugging from the car and shaking it to listen for movement of the valve. I just need to find where the PCV valve is hiding under the bonnet so i can test it.

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